//! SHA  
//! FIPS 180-4  
//! https://www.cnblogs.com/mengsuenyan/p/12697811.html  

use std::ops::{BitXor, BitAnd, Not};

pub(in crate::sha) const SHA1_BLOCK_SIZE: usize = 64;
pub(in crate::sha) const SHA1_WORD_LEN: usize = 4;
pub(in crate::sha) const SHA1_DIGEST_SIZE: usize = 20;
pub(in crate::sha) const SHA1_DIGEST_WSIZE: usize = 5;

pub(in crate::sha) const SHA224_BLOCK_SIZE: usize = 64;
// pub(super) const SHA224_WORD_LEN: usize = 4;
pub(in crate::sha) const SHA224_DIGEST_SIZE: usize = 28;
// pub(super) const SHA224_DIGEST_WSIZE: usize = 7;

pub(in crate::sha) const SHA256_BLOCK_SIZE: usize = 64;
pub(in crate::sha) const SHA256_WORD_LEN: usize = 4;
pub(in crate::sha) const SHA256_DIGEST_SIZE: usize = 32;
pub(in crate::sha) const SHA256_DIGEST_WSIZE: usize = 8;

// pub(super) const SHA512T384_BLOCK_SIZE: usize = 128;
// pub(super) const SHA384_WORD_LEN: usize = 8;
pub(in crate::sha) const SHA512T384_DIGEST_SIZE: usize = 48;
// pub(super) const SHA512T384_DIGEST_WSIZE: usize = 6;

pub(in crate::sha) const SHA512_BLOCK_SIZE: usize = 128;
// pub(super) const SHA512_WORD_LEN: usize = 8;
pub(in crate::sha) const SHA512_DIGEST_SIZE: usize = 64;
pub(in crate::sha) const SHA512_DIGEST_WSIZE: usize = 8;

// pub(super) const SHA512T224_BLOCK_SIZE: usize = 128;
// pub(super) const SHA512_224_WORD_LEN: usize = 8;
pub(in crate::sha) const SHA512T224_DIGEST_SIZE: usize = 28;
// pub(super) const SHA512T224_DIGEST_WSIZE: usize = 3;
//
// pub(super) const SHA512T256_BLOCK_SIZE: usize = 128;
// pub(super) const SHA512_256_WORD_LEN: usize = 8;
pub(in crate::sha) const SHA512T256_DIGEST_SIZE: usize = 32;
// pub(super) const SHA512T256_DIGEST_WSIZE: usize = 4;

pub(in crate::sha) const SHA1_INIT: [u32; SHA1_DIGEST_WSIZE] = [0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0];
pub(in crate::sha) const SHA1_K: [u32; 4] = [0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xCA62C1D6];

pub(in crate::sha) const SHA224_INIT: [u32; SHA256_DIGEST_WSIZE] = [0xC1059ED8, 0x367CD507, 0x3070DD17, 0xF70E5939, 0xFFC00B31, 0x68581511, 0x64F98FA7, 0xBEFA4FA4,];

pub(in crate::sha) const SHA256_INIT: [u32; SHA256_DIGEST_WSIZE] = [0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19];
pub(in crate::sha) const SHA256_K: [u32; 64] = [
    0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5,
    0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174,
    0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da,
    0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967,
    0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85,
    0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,0xd192e819,0xd6990624,0xf40e3585,0x106aa070,
    0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3,
    0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2,
];

pub(in crate::sha) const SHA512_INIT: [u64; SHA512_DIGEST_WSIZE] = [0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1, 0x510e527fade682d1, 0x9b05688c2b3e6c1f, 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179, ];
pub(in crate::sha) const SHA512_K: [u64; 80] = [
    0x428a2f98d728ae22,0x7137449123ef65cd,0xb5c0fbcfec4d3b2f,0xe9b5dba58189dbbc,0x3956c25bf348b538,0x59f111f1b605d019,0x923f82a4af194f9b,0xab1c5ed5da6d8118,
    0xd807aa98a3030242,0x12835b0145706fbe,0x243185be4ee4b28c,0x550c7dc3d5ffb4e2,0x72be5d74f27b896f,0x80deb1fe3b1696b1,0x9bdc06a725c71235,0xc19bf174cf692694,
    0xe49b69c19ef14ad2,0xefbe4786384f25e3,0x0fc19dc68b8cd5b5,0x240ca1cc77ac9c65,0x2de92c6f592b0275,0x4a7484aa6ea6e483,0x5cb0a9dcbd41fbd4,0x76f988da831153b5,
    0x983e5152ee66dfab,0xa831c66d2db43210,0xb00327c898fb213f,0xbf597fc7beef0ee4,0xc6e00bf33da88fc2,0xd5a79147930aa725,0x06ca6351e003826f,0x142929670a0e6e70,
    0x27b70a8546d22ffc,0x2e1b21385c26c926,0x4d2c6dfc5ac42aed,0x53380d139d95b3df,0x650a73548baf63de,0x766a0abb3c77b2a8,0x81c2c92e47edaee6,0x92722c851482353b,
    0xa2bfe8a14cf10364,0xa81a664bbc423001,0xc24b8b70d0f89791,0xc76c51a30654be30,0xd192e819d6ef5218,0xd69906245565a910,0xf40e35855771202a,0x106aa07032bbd1b8,
    0x19a4c116b8d2d0c8,0x1e376c085141ab53,0x2748774cdf8eeb99,0x34b0bcb5e19b48a8,0x391c0cb3c5c95a63,0x4ed8aa4ae3418acb,0x5b9cca4f7763e373,0x682e6ff3d6b2b8a3,
    0x748f82ee5defb2fc,0x78a5636f43172f60,0x84c87814a1f0ab72,0x8cc702081a6439ec,0x90befffa23631e28,0xa4506cebde82bde9,0xbef9a3f7b2c67915,0xc67178f2e372532b,
    0xca273eceea26619c,0xd186b8c721c0c207,0xeada7dd6cde0eb1e,0xf57d4f7fee6ed178,0x06f067aa72176fba,0x0a637dc5a2c898a6,0x113f9804bef90dae,0x1b710b35131c471b,
    0x28db77f523047d84,0x32caab7b40c72493,0x3c9ebe0a15c9bebc,0x431d67c49c100d4c,0x4cc5d4becb3e42b6,0x597f299cfc657e2a,0x5fcb6fab3ad6faec,0x6c44198c4a475817,
];

pub(in crate::sha) const SHA512_224INIT: [u64; SHA512_DIGEST_WSIZE] = [0x8c3d37c819544da2, 0x73e1996689dcd4d6, 0x1dfab7ae32ff9c82, 0x679dd514582f9fcf, 0x0f6d2b697bd44da8, 0x77e36f7304c48942, 0x3f9d85a86a1d36c8, 0x1112e6ad91d692a1, ];

pub(in crate::sha) const SHA512_256INIT: [u64; SHA512_DIGEST_WSIZE] = [0x22312194fc2bf72c, 0x9f555fa3c84c64c2, 0x2393b86b6f53b151, 0x963877195940eabd, 0x96283ee2a88effe3, 0xbe5e1e2553863992, 0x2b0199fc2c85b8aa, 0x0eb72ddc81c52ca2, ];

pub(in crate::sha) const SHA512_384INIT: [u64; SHA512_DIGEST_WSIZE] = [0xcbbb9d5dc1059ed8, 0x629a292a367cd507, 0x9159015a3070dd17, 0x152fecd8f70e5939, 0x67332667ffc00b31, 0x8eb44a8768581511, 0xdb0c2e0d64f98fa7, 0x47b5481dbefa4fa4, ];

#[inline]
pub(in crate::sha) fn f_ch<T>(x: T, y: T, z: T) -> T
    where T: Not<Output=T> + BitXor<Output=T> + BitAnd<Output=T> + Copy
{
    (x & y) ^ ((!x) & z)
}

#[inline]
pub(in crate::sha) fn f_parity(x: u32, y: u32, z: u32) -> u32 {
    (x ^ y) ^ z
}

#[inline]
pub(in crate::sha) fn f_maj<T>(x: T, y: T, z: T) -> T
    where T: Not<Output=T> + BitXor<Output=T> + BitAnd<Output=T> + Copy
{
    (x & y) ^ (x & z) ^ (y & z)
}
    
